/*
silverPDF is sponsored by Aleyant Systems (http://www.aleyant.com)

silverPDF is based on PdfSharp (http://www.pdfsharp.net) and iTextSharp (http://itextsharp.sourceforge.net)

Developers: Ai_boy (aka Oleksii Okhrymenko)

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above information and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR SPONSORS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

*/
#region PDFsharp - A .NET library for processing PDF
//
// Authors:
//   Stefan Lange (mailto:Stefan.Lange@pdfsharp.com)
//
// Copyright (c) 2005-2008 empira Software GmbH, Cologne (Germany)
//
// http://www.pdfsharp.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.Diagnostics;
using System.Collections;
using PdfSharp.Drawing;
using PdfSharp.Pdf.Advanced;
using PdfSharp.Pdf.Annotations;
using PdfSharp.Pdf.Internal;

namespace PdfSharp.Pdf.AcroForms
{
  /// <summary>
  /// Represents the text field.
  /// </summary>
  public sealed class PdfTextField : PdfAcroField
  {
    /// <summary>
    /// Initializes a new instance of PdfTextField.
    /// </summary>
    internal PdfTextField(PdfDocument document)
      : base(document)
    {
    }

    internal PdfTextField(PdfDictionary dict)
      : base(dict)
    {
    }

    /// <summary>
    /// Gets or sets the text value of the text field.
    /// </summary>
    public string Text
    {
      get { return Elements.GetString(Keys.V); }
      set { Elements.SetString(Keys.V, value); RenderAppearance(); } //HACK
    }

    /// <summary>
    /// Gets or sets the font used to draw the text of the field.
    /// </summary>
    public XFont Font
    {
      get { return this.font; }
      set { this.font = value; }
    }
    XFont font = new XFont("Courier New", 10);

    /// <summary>
    /// Gets or sets the foreground color of the field.
    /// </summary>
    public XColor ForeColor
    {
      get { return this.foreColor; }
      set { this.foreColor = value; }
    }
    XColor foreColor = XColors.Black;

    /// <summary>
    /// Gets or sets the background color of the field.
    /// </summary>
    public XColor BackColor
    {
      get { return this.backColor; }
      set { this.backColor = value; }
    }
    XColor backColor = XColor.Empty;

    /// <summary>
    /// Gets or sets the maximum length of the field.
    /// </summary>
    /// <value>The length of the max.</value>
    public int MaxLength
    {
      get { return Elements.GetInteger(Keys.MaxLen); }
      set { Elements.SetInteger(Keys.MaxLen, value); }
    }

    /// <summary>
    /// Gets or sets a value indicating whether the field has multiple lines.
    /// </summary>
    public bool MultiLine
    {
      get { return (Flags & PdfAcroFieldFlags.Multiline) != 0; }
      set
      {
        if (value)
          SetFlags |= PdfAcroFieldFlags.Multiline;
        else
          SetFlags &= ~PdfAcroFieldFlags.Multiline;
      }
    }

    /// <summary>
    /// Gets or sets a value indicating whether this field is used for passwords.
    /// </summary>
    public bool Password
    {
      get { return (Flags & PdfAcroFieldFlags.Password) != 0; }
      set
      {
        if (value)
          SetFlags |= PdfAcroFieldFlags.Password;
        else
          SetFlags &= ~PdfAcroFieldFlags.Password;
      }
    }

    /// <summary>
    /// Creates the normal appearance form X object for the annotation that represents
    /// this acro form text field.
    /// </summary>
    void RenderAppearance()
    {
      PdfRectangle rect = Elements.GetRectangle(PdfAnnotation.Keys.Rect);
      XForm form = new XForm(this.document, rect.Size);
      XGraphics gfx = XGraphics.FromForm(form);

      if (backColor != XColor.Empty)
        gfx.DrawRectangle(new XSolidBrush(BackColor), rect.ToXRect() - rect.Location);

      string text = Text;
      if (text.Length > 0)
        gfx.DrawString(Text, Font, new XSolidBrush(ForeColor),
          rect.ToXRect() - rect.Location + new XPoint(2, 0), XStringFormats.TopLeft);

      form.DrawingFinished();

      // Get existing or create new appearance dictionary
      PdfDictionary ap = Elements[PdfAnnotation.Keys.AP] as PdfDictionary;
      if (ap == null)
      {
        ap = new PdfDictionary(this.document);
        Elements[PdfAnnotation.Keys.AP] = ap;
      }

      // Set XRef to normal state
      ap.Elements["/N"] = form.PdfForm.Reference;
    }

    internal override void PrepareForSave()
    {
      base.PrepareForSave();
      RenderAppearance();
    }

    /// <summary>
    /// Predefined keys of this dictionary. 
    /// The description comes from PDF 1.4 Reference.
    /// </summary>
    public new class Keys : PdfAcroField.Keys
    {
      /// <summary>
      /// (Optional; inheritable) The maximum length of the field�s text, in characters.
      /// </summary>
      [KeyInfo(KeyType.Integer | KeyType.Optional)]
      public const string MaxLen = "/MaxLen";

      /// <summary>
      /// Gets the KeysMeta for these keys.
      /// </summary>
      internal static DictionaryMeta Meta
      {
        get
        {
          if (Keys.meta == null)
            Keys.meta = CreateMeta(typeof(Keys));
          return Keys.meta;
        }
      }
      static DictionaryMeta meta;
    }

    /// <summary>
    /// Gets the KeysMeta of this dictionary type.
    /// </summary>
    internal override DictionaryMeta Meta
    {
      get { return Keys.Meta; }
    }
  }
}
